EP0157190B1 - Procédé de décapage d'aluminium - Google Patents

Procédé de décapage d'aluminium Download PDF

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Publication number
EP0157190B1
EP0157190B1 EP19850102400 EP85102400A EP0157190B1 EP 0157190 B1 EP0157190 B1 EP 0157190B1 EP 19850102400 EP19850102400 EP 19850102400 EP 85102400 A EP85102400 A EP 85102400A EP 0157190 B1 EP0157190 B1 EP 0157190B1
Authority
EP
European Patent Office
Prior art keywords
process according
bath
pickling
aluminium
pickling bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19850102400
Other languages
German (de)
English (en)
Other versions
EP0157190A1 (fr
Inventor
Prof. Dr. E. Plattner
Ch. Dr. Comninellis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cessione metallgesellschaft AG
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CH1325/84A external-priority patent/CH660201A5/fr
Application filed by Individual filed Critical Individual
Priority to AT85102400T priority Critical patent/ATE54679T1/de
Publication of EP0157190A1 publication Critical patent/EP0157190A1/fr
Application granted granted Critical
Publication of EP0157190B1 publication Critical patent/EP0157190B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/32—Alkaline compositions
    • C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/46—Regeneration of etching compositions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/22—Light metals
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/36—Regeneration of waste pickling liquors

Definitions

  • the low concentration of the pickling bath in dissolved substances also helps to keep the chemical loss caused by entrainment at a low level. The loss decreases even further if the pickled pieces are drained properly and the rinsing water is recycled.

Claims (13)

1. Procédé de décapage d'aluminium dans un bain de lessive alcaline, avec précipitation simultanée d'hydroxyde d'aluminium in situ et régénération simultanée de la lessive alcaline consommée au cours du décapage, le procédé étant caractérisé en ce que l'on emploie un bain de décapage qui contient moins de 10 g/I de lessive de soude caustique ou de lessive de potasse caustique et, en tant qu'agent complexant, du gluconate de sodium, que le bain est exempt de sulfures, de sulfates, de phosphates et de thiosulfates, et en ce que l'hydroxyde d'aluminium qui se forme dans le bain de décapage précipite sans modification de la température du dit bain.
2. Procédé suivant la revendication 1, caractérisé en ce que l'on emploie un bain de décapage qui contient 3 g/I à 6 g/1 de lessive de soude caustique ou de lessive de potasse caustique et 2 g/I à 20 g/I d'aluminium à l'état dissous.
3. Procédé suivant l'une ou l'autre des revendications 1 et 2, caractérisé en ce que l'on ajoute un sel alcalin au bain de décapage.
4. Procédé suivant la revendication 3, caractérisé en ce que l'on ajoute comme sel alcalin, au bain de décapage, du carbonate de sodium.
5. Procédé suivant la revendication 4, caractérisé en ce que l'on ajoute le carbonate de sodium au bain de décapage en une quantité de l'ordre de 5 g/I à 100 g/I.
6. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que l'on ajoute le gluconate de sodium au bain de décapage en une quantité de l'ordre de 0,01 g/I à 1,0 g/1.
7. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que la température du bain de décapage est de l'ordre de 50°C à 75°C.
8. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que l'hydroxyde d'aluminium ayant précipité est retiré du bain de décapage de façon continue ou par lots.
9. Procédé suivant la revendication 8, caractérisé en ce que l'on retire l'hydroxyde d'aluminium du bain de décapage lorsque la teneur du bain de décapage en matière solide dépasse la valeur de 10 g/1 à 30 g/I.
10. Procédé suivant l'une ou l'autre des revendications 8 et 9, caractérisé en ce que l'on effectue le retrait de l'hydroxyde d'aluminium d'une partie du bain.
11. Procédé suivant l'une quelconque des revendications 8 à 10, caractérisé en ce que l'on effectue le retrait de l'hydroxyde d'aluminium par décantation et/ou par filtrage.
12. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que l'on ramène dans leur totalité ou en partie, dans le bain de décapage, le filtrat ayant précipité lors du retrait de
13. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que les pertes du bain de décapage en produits chimiques sont compensées par l'addition de quantités de produits au bam de décapage en produits chimiques sont compensées par l'addition de quantités de produits chimiques frais qui correspondent à ces pertes.
EP19850102400 1984-03-16 1985-03-04 Procédé de décapage d'aluminium Expired - Lifetime EP0157190B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85102400T ATE54679T1 (de) 1984-03-16 1985-03-04 Beizverfahren fuer aluminium.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH1325/84 1984-03-16
CH1325/84A CH660201A5 (fr) 1984-03-16 1984-03-16 Procede de decapage de l'aluminium dans un bain de lessive alcaline.
DE19843426114 DE3426114A1 (de) 1984-03-16 1984-07-16 Beizverfahren fuer aluminium
DE3426114 1984-07-16

Publications (2)

Publication Number Publication Date
EP0157190A1 EP0157190A1 (fr) 1985-10-09
EP0157190B1 true EP0157190B1 (fr) 1990-07-18

Family

ID=25687339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850102400 Expired - Lifetime EP0157190B1 (fr) 1984-03-16 1985-03-04 Procédé de décapage d'aluminium

Country Status (1)

Country Link
EP (1) EP0157190B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1932948A1 (fr) * 2006-12-07 2008-06-18 Italtecno S.R.L. Appareil et procédé pour la récupération de soude caustique de solutions caustiques
DE102008063729A1 (de) * 2008-11-03 2010-05-06 König, Thomas Beizverfahren und Beizanlage
WO2010060408A2 (fr) 2008-11-03 2010-06-03 Koenig Thomas Procédé et installation de décapage
DE102013108375A1 (de) * 2013-01-31 2014-07-31 Thomas König Verfahren zum Aufbereiten eines Beiz- und/oder Eloxalbades und Eloxieranordnung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5512129A (en) * 1990-03-15 1996-04-30 Josef Gartner & Co. Method for regenerating alkaline solutions for pickling aluminum
DE4008379A1 (de) * 1990-03-15 1991-09-19 Gartner & Co J Verfahren und anlage zum regenerieren von alkalihaltigen aluminiumbeizloesungen
CN112921316A (zh) * 2021-01-20 2021-06-08 福建省闽发铝业股份有限公司 一种绿色环保铝型材喷涂前处理工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1073272B (de) * 1960-01-14 Amchem Products Ine Ambler Pa (V St A) andsdale Mounted Route Pa (V St A ) I Losung und Mittel zum Ätzen von Aluminium
US2653861A (en) * 1953-03-09 1953-09-29 Enthone Etching aluminum using hexahydroxyheptanoic acid as a modifier
US2884728A (en) * 1954-08-16 1959-05-05 Turco Products Inc Apparatus and method for removing metal from the surface of a metal object
FR1582144A (fr) * 1968-06-24 1969-09-26
GB1420920A (en) * 1971-12-30 1976-01-14 Diversey Ltd Etching compositions
DE2439202C3 (de) * 1974-08-16 1979-09-27 Friedr. Blasberg Gmbh & Co Kg, 5650 Solingen Alkalisch wäßriges Bad zum Ätzen von Aluminium und Aluminiumlegierungen
FR2555615B1 (fr) * 1983-11-24 1990-05-11 Diversey France Bain de traitement de l'aluminium et procede mettant en oeuvre ce bain notamment dans le domaine du satinage et de l'usinage chimique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1932948A1 (fr) * 2006-12-07 2008-06-18 Italtecno S.R.L. Appareil et procédé pour la récupération de soude caustique de solutions caustiques
DE102008063729A1 (de) * 2008-11-03 2010-05-06 König, Thomas Beizverfahren und Beizanlage
WO2010060408A2 (fr) 2008-11-03 2010-06-03 Koenig Thomas Procédé et installation de décapage
DE102013108375A1 (de) * 2013-01-31 2014-07-31 Thomas König Verfahren zum Aufbereiten eines Beiz- und/oder Eloxalbades und Eloxieranordnung

Also Published As

Publication number Publication date
EP0157190A1 (fr) 1985-10-09

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